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Length of a String

Certification: Basic Level Accuracy: 70% Submissions: 10 Points: 5

Write a C++ program that finds the length of a given string without using the `strlen()` function.

Example 1
    
  
  • Input: string = "Hello"
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  • Output: 5
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  • Explanation:
    
      
      
    • Step 1: Initialize a counter variable to 0.
      • 
      
    • Step 2: Iterate through the string until reaching the null terminator.
      • 
      
    • Step 3: Increment the counter for each character encountered.
      • 
      
    • Step 4: Return the final counter value.
      • 
    
    
  
    •
Example 2
    
  
  • Input: string = "C++ Programming"
    • 
  
  • Output: 15
    • 
  
  • Explanation:
    
      
      
    • Step 1: Initialize a counter variable to 0.
      • 
      
    • Step 2: Iterate through the string until reaching the null terminator.
      • 
      
    • Step 3: Increment the counter for each character encountered.
      • 
      
    • Step 4: Return the final counter value.
      • 
    
    
  
    •
Constraints
    
  
  • 1 ≤ len(string) ≤ 10^6
    • 
  
  • The string contains printable ASCII characters.
    • 
  
  • Time Complexity: O(n), where n is the length of the string
    • 
  
  • Space Complexity: O(1)
    •
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Hint
Solution

Solution Hints

    
  
  • Iterate through the string using a loop until the null character (`'\0'`) is encountered.
    • 
  
  • Count the number of characters iterated.
    •

Steps to solve by this approach:

 Step 1: Define a function stringLength that takes a constant character pointer as parameter.
 Step 2: Initialize a length counter to zero.
 Step 3: Loop through the string until the null terminator is encountered.
 Step 4: Increment the length counter for each character.
 Step 5: Return the final length value.
 Step 6: In main, call stringLength with a string and print the result.

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